Introduction to the Triangle Universities Nuclear Laboratory John Kelley NCSU and TUNL Overview of...

Introduction to the Triangle Universities Nuclear Laboratory

John Kelley NCSU and TUNL

Overview of TUNL Physics Program

Emphasis on neutron induced partial cross section measurements

Laboratory

• Tandem Accelerator Laboratory • High Intensity -ray Source (HIGS)• Lab for Experimental Nuclear Astrophysics• Low background Radiation Counting Area

• Offsite projects: Los Alamos, Oak Ridge, KamLAND, JLab, Argonne Nat’l Lab, etc…

Physicists at TUNL (highlights)

• Nuclear Astrophysics

• Weak Interactions studies

• Fundamental Quantity Measurements

• Nucleon Structure

• Few-nucleon Interactions

• Nuclear Spectroscopy

• Nuclear Reactions Studies

LENA• Formation of the elements attracts our curiosities• Measurements of relevant Astrophysical Reaction rates are very difficult

– Rates change drastically with energy (star temperature) – Low energies are most important– Hindered by Coulomb force

Energy (keV)

50 150 250 350 4501

100

10000

1E+06

1E+08

1E+10

1E+12

1E+14

Cro

ss s

ect

ion [

Arb

. U

nit

s)Cross section

LENA

Ge DetectorTarget Assembly

NaI Annulus

Ge - NaI Detector Setup

Lead Shield

Shield Low Energy Environmental Background

Veto High Energy Cosmic Rays

Coincidence Gate On -rays Of Interest

Weak Interaction Studies

Fundamental Physics Quantities

• EDM

HIGS Laboratory

Nucleon Structure

Nucleon Structure

Nuclear Spectroscopy

Nuclear Astrophysics

Tandem Vander graph Lab

Few-body dynamics• n-d breakup

• For the simple 3-body system, we are unable to calculate simple observables.

Few-body dynamics

Nuclear Spectroscopy

• Nuclear Resonance Flouresence– Resonant -ray scattering

Before too longthings are out of control